May, 31st, 1985, was a Friday.
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31st October 1993 was a Sunday.
October 31, 1980, was a Friday.
January 31st, 1939 was a Tuesday.
In order to know what day of the week a day in February 1985 was one needs to know the date in February.
February 29th, 1985 was actually a leap year. So, this day of the week did not occur.